Well, I've discovered del.icio.us. I think it's a pretty nifty tool to keep track of websites you like.
One thing I found useful was importing my bookmarks I already keep on Firefox. This not only made me feel very productive, but showed me who was linking to sites I visit frequently.
I am using del.icio.us for a project I am involved with for the Commission on Women. We are each charged with looking through the web pages of other institutions who have obtained an ADVANCE grant from NSF. It allows for notes and direct links to documents and pdf's. Here is a link to the pages I've tagged with 'Advance':